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#include <iostream>
using namespace std;
const int MAX_SIZE = 1024;
int deletedFromStartToSubset(char src[], int srcLen, char toCheck[], int toCheckLen) {
for (int i = 0, j = 0; i <= srcLen - toCheckLen; i++) {
/* Check if values from toCheck correspond to those of src with offset */
for (j = 0; j < toCheckLen; j++) {
if (src[j + i] != toCheck[j])
break;
}
if (j == toCheckLen)
return i;
}
return -1;
}
int deletedAndRotationIsSubset(char src[], int srcLen, char toCheck[], int toCheckLen) {
for (int rot = 0; rot < toCheckLen; rot++) {
/* Check if subset */
int deleted = deletedFromStartToSubset(src, srcLen, toCheck, toCheckLen);
if (deleted >= 0)
return deleted;
/* Rotate toCheck */
char lastVal = toCheck[toCheckLen - 1];
for (int i = toCheckLen - 2; i >= 0; i--) {
toCheck[i + 1] = toCheck[i];
}
toCheck[0] = lastVal;
}
return -1;
}
/* Bonus */
int validRotationByDelSrc(char src[], int srcLen, char toCheck[], int toCheckLen, int deletedIndexes[]) {
char common[MAX_SIZE];
int di = 1;
for (int i = 0, ci = 0; i < srcLen; i++) {
for (int j = 0; j < toCheckLen; j++) {
if (src[i] == toCheck[j]) {
common[ci++] = toCheck[j];
deletedIndexes[di++] = i; // I know this is wrong, but I didn't have time to fix it :D
break;
}
}
}
deletedIndexes[0] = di; // Length at position 0
return deletedAndRotationIsSubset(common, toCheckLen, toCheck, toCheckLen);
}
int main() {
/* Get input */
cout << "size1: ";
int size1;
cin >> size1;
cout << "size2: ";
int size2;
cin >> size2;
cout << "firstArr: ";
char firstArr[MAX_SIZE];
for (int i = 0; i < size1; i++)
cin >> firstArr[i];
cout << "secondArr: ";
char secondArr[MAX_SIZE];
for (int i = 0; i < size2; i++)
cin >> secondArr[i];
/* Output result */
int deleted = deletedAndRotationIsSubset(firstArr, size1, secondArr, size2);
if (deleted == -1) {
int deletedIndexes[MAX_SIZE];
deleted = validRotationByDelSrc(firstArr, size1, secondArr, size2, deletedIndexes);
if (deleted == -1)
cout << "No rotations found!" << endl;
else {
cout << "Rotation \"";
for (int i = 0; i < size2; i++)
cout << secondArr[i];
cout << "\" found after deleting characters: ";
for (int i = 1; i < deletedIndexes[0]; i++)
cout << deletedIndexes[i] << " ";
cout << endl;
}
}
else {
cout << "Rotation \"";
for (int i = 0; i < size2; i++)
cout << secondArr[i];
cout << "\" found after deleting " << deleted << " characters from the start and " << (size1 - size2 - deleted) << " characters from the end." << endl;
}
}
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